Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 866 · 40 questions

Robot tip (Spin or point): DC motor: spins continuously; swap its wires to reverse it. Servo: goes to a set angle between 0° and 180°. Servo turn = bigger angle − smaller angle (30° to 120° = 90°). A program like angle = 90, angle = angle + 30 adds and takes away degrees in order.

1. 1.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a DC motor (d) a buzzer
3. 3.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
4. 4.🦾 A servo moves from 160° to 120°. How many degrees does it turn?
5. 5.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
6. 6.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
7. 7.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) shake it (d) add more wheels
8. 8.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points right (b) points left (c) points straight up (d) points up and right
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
10. 10.🦾 A servo moves from 0° to 110°. How many degrees does it turn?
11. 11.🦾 A servo moves from 70° to 130°. How many degrees does it turn?
12. 12.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points up and left (b) points left (c) points up and right (d) points right
13. 13.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
15. 15.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
16. 16.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
17. 17.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
18. 18.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
19. 19.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
20. 20.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
21. 21.🦾 A servo moves from 150° to 130°. How many degrees does it turn?
22. 22.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
24. 24.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
25. 25.🦾 A servo moves from 40° to 130°. How many degrees does it turn?
26. 26.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
27. 27.🦾 A servo moves from 140° to 100°. How many degrees does it turn?
28. 28.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo moves from 10° to 160°. How many degrees does it turn?
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
31. 31.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
33. 33.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points up and left (b) points up and right (c) points left (d) points right
34. 34.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
35. 35.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
36. 36.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 50
    angle = angle − 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
39. 39.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
40. 40.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False

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